State Key Laboratory of Oncology in South China;
Guangzhou;
Guangdong 510060;
P. R. China;
Department of Epidemiology;
Sun Yat-sen University Cancer Center;
Guangzhou;
Guangdong 510060;
P. R. China;
Cancer Institute;
Second Affiliated Hospital;
School of Medicine;
Zhejiang University;
Hangzhou;
Zhejiang 310009;
P. R. China;
Department of Nasopharyngeal Carcinoma;
Sun Yat-senUniversity Cancer Center;
Guangzhou;
Guangdong 510060;
P. R. China;
Research Institute;
Sun Yat-sen University Cancer Center;
Guangzhou;
Guangdong 510060;
P. R. China;